Tool for laying out cams.



A. H. SIMONS.

TOOL PoR LAYING OUT CAMS.

APPLICATION FILED NOV. 1, 1912. 1 133,585, Patented Mar. 30, 1915. 2 SHEETS-SHEET 1 RS Co P OTo-LlTHo.. WASHINGTON. D. r

A. H. SIMONS.'

TOOL POR LAYING OUT CAMS.

APPLICATION FILED NOV. 1, 1912.

1,133,585. Patented Mar. 30, 1915.

2 SHEETS-SHEET 2.

/l' 6566,' Q/ M2325 By/lf dmg, da WL. ,wlafy THE MORRIS PETERS C0.. FHOTO-LITHO.. WASHINGTON. D. L..

ALBERT E. SIMON'OF BUFFALO, NEW YORK.

TOOL FOR LAYING OUT CAMS.

T0 all 'LU/0m t may concern:

it known that l, ALBERT H. SIMoNs, 'a citizen of the United States, residing at ludalo, in the county of Erie and State of New York, have invented certain new and useful Improvements in rfools for Laying Out Cams, or' which the following 1s a speciication.

invention relates to improvements in tools for laying out cams, and it has for its oli-ject the provision of a simple and inexpensive tool whereby cam blanks, from which cams are to be constructed, can be conveniently laid out preparatory to machining the saine to proper form. I A

Wlith this object in view the invention consists in the novel features of construction and in the arrangement and combination of parts to be hereinafter described and particularly pointed out in the subjoined claims. A

ln the drawings,-Figure l is a plan view ot my improved tool showing the same applied to a cam-blank with the cam to be machined from said blank shown in do-tted lines. F ig. 9. is a. cross section taken on iine 2 2, Fig. l. Fig. 3 is a section taken at right angles to Fig. 2 on line 3 3, Fig. l. Fig. a is an enlarged cross section taken on line Lime/1l, Fig. 3. Fig. 5 is a section through the central portion of the tool taken on line 3 3, Fig. l. Fig. 6 is a plan view showing a modified form of my in- \.'ention. A

lReferring now to the drawings in detail like characters of reference refer to like parts in the several figures.

The reference letter A'represents a calnblank, such as may be purchased in the market and from which a cam is to be constructed. This blank has a central opening a and a pin hole B a short distance 'from said central opening.

My improved tool is to be applied to the cameblank and in the embodiment of my invention shown and described comprises a body-portion (l in the form of a dial or disk, and an adjustable bar D secured to said disk and slidable diametrically. Vith a view of increasing the eiiciency and iacility with which a cam may be laid out l also provide adjusting means E for conveniently adjusting the bar D, which is preferably a scale-bar, and a marking device F adapted to mark the cam-blank dur- Speccaton of Letters Patent.

Application led November 1, 1912.

Patented lidar. 30, ii.

serial no. manco.

ing the operation of laying out the cam on said blank. The dial or disk C is graduated around its marginal portion and in practice l ind it convenient to divide the disk into one hundred equal parts or divisions, as at G. 'the disk also has a hollow boss c on its underside which is adapted to be inserted 1n the center opening a of the cam-blank, the dial or disk portion proper bearing against the cam-blank, as clearly shown in lfigs. i). and 3. Rotatably arranged in the hollow boss c of the dial is a plug H having a groove h. arranged crosswise in its upper tace, one edge or side wall of said groove extending diametrically through the axis ot' said plug. Fitting into said groove is the scale-bar D which is held against accidental removal by a thumb screw J threaded into the plug and impinging against the scale-bar, as at j, F ig. 2. The graduations of this scale-bar may be divided into sixty-four parts to the inch, or any other division may be made, and arranged centrally on said plug is a Zero or indicating mark K from which the scale-bar may be set.

in order to prevent turning of the dial C in the center opening a of the cam-blank, said dial has a pin or stud L on its underside adapted to enter the pin hole B in said cam-blank, and as it is the intention to use this dial in laying out cams of different sizes, the pin or stud L is preferably made adjustable toward and from the axis of the saine. F or this purpose said dial is provided with a radial slot M through which is passed a screw fm, that takes into the pin or stud L. ln order therefore to use the dial on cani-blanks olI different sizes in which the distances of the pin holes from the axes of the cam-blanks dider it is only necessary to loosen the screw fm, and shift the same with the pin or stud L lengthwise in the radial slot M until it is brought into registration with the pin hole in the cam-blank.

rlhe adjusting means whereby the scalebar D is adjusted in the groove of' the plug l-l so as to bring the marking device the proper distance from the axis of the dial C comprises preferably a screw-rod N having its threads arranged at a certain pitch, said screw-rod being arranged parallel with the scale-bar and having its inner end bent downwardly, as at a, and threaded or otherill Wise fastened into the plug H so as to be absolutely rigid with the latter and rotate therewith, and as the scale-bar D is permitted only lengthwise movement in the plug H it is also rotatable with said plug. Fastened to the scale-bar near one end is a yoke O, the means of fastening the same to said bar being illustrated in lfig. '-l, Wherein said yoke is shown as provided with a notch o into'which one edge of the scale-bar fits; the other edge of said scale-bar being clamped b v the l.-shaped head 7,; of a clan'iping screw P, said screw passing through the yoke and having a nut Q. applied thereto to draw the head of the screw l firmly against the scale-bar and clamp the same tightly for the purpose of causing the scale-bar to travel with the yoke. Y

In order to cause the yoke O to travel, the screw-rod N isarranged to pass centrally therethrough, a graduated internally-threadedsleeve R being tln'eaded onto said screwrod yll and having a reduced portion extending through said yoke, said reduced portion forming a shoulder adapted to lie in contact with oneside of the yoke and extending a distance beyondthe opposite side of said yoke and having its extended portion externally-threaded to receive a knurled nut S Which bears against the yoke and against which a knurled jam nut s impinges. The sleeve R and the nuts S, s, constitute a rotatable member threaded onto the screw-rod and rotatable Within the yoke O, the turning of said rotatable member in one direction causing said yoke to be moved toward the inner end of said screw-rod, While the turning Vthereof in the opposite direction causes'the same to move toward the outer end of said screw-rod. Since the scale-bar is secured to the yoke O, said bar is caused to travel in the groove of the plug H in the same` direction as the yoke. The sleeve R haspreferably twenty-five graduation marks around its peripheral face which are adapted vto be adjusted to a Zero or indicating niark T on the yoke O.

Applied to the opposite end of the scalebar in yany suitable manner is the marking device F which in the form illustrated comprises a head TJ which is clamped to the scale-.bar Din any suitable manner and has threaded opening therein into which is threaded a sleeve V. Through said sleeve is passed a punch pin or needle W having a collar w between which and the inner end of said sleeve a c oil spring X is located, said coil spring surrounding the punch pin or needle and holding the same elevated, and in order that the pin be retained in position. a'bushing is threaded into the upper end of the sleeve V against which said collar bears. The inner or lower end of said punch pin is pointed, as at Y, so that when forced against the cam-blank it Will leave its impression. Itl is of course understood thatY any other marking device suitable for the purpose intended may be substituted for that herein shown and described.

In laying out a cam on the cam-blank the dial is placed in position on the blank With the boss 0 fitting into 4the center opening a thereof and the pin L fitting into the pin hole B. rlhe scale-bar is then moved to the desired starting position by actuating the adjusting means E with a view of placing the punch pin the proper distance from the axis of the dial, which axis is also the axis of the cam-blank. lThe punch pin is then'l depressed or struck to leave its impression on' the face of the cam-blank and in order to obtain the rise or drop of the cam the plug l-l'isrotated one one-hundredths of the camlsurface or from one graduation of the dial to' the next. W hen in this position the rotatable adjusting member on the screwrod N is revolved to cause the scale-bar With its punch pin to be moved toward or from the axis of the disk, depending` on Whether a rise or drop is desired on the cam surface7 the exact amount of adjustment being previously ascertained and being nicely located bv the graduations of the rotatable adjusting member threaded onto the screw-rod N. If, for example, with forty threads on the screw-rod to the inch the rotatable adjust-V ing member I is turned one one-twenty fth of a complete revolution the scale-bar D is moved toward or from the axis of the dial one one-thousandth of an inch. lVhen adjustingthe sleale-bar the graduations thereon are not used, as they are employed solely when starting'to lay out the-cam and the exact starting point is desired. When the starting vpoint is located the proper distance from the axis of the dial the plug in the dial is rotated one one-hundredth of a revolution and the adjustment of the scale-bar with its punch pin is then made according to the increase or decrease in the diameter of the cam by rotating the rotatable adjusting member one one-twenty fifth of a complete revolution causing an adjustment of the scale-bar one one-thousandth of an inch in one one-hundredth of the complete circumference ofthe cam-blank. Of course, if the rise or fall of the cam within one onehundredth of the circumference of the camblank is greater than one one-thousandth of an inch, the'adjusting member is rotated accordingly either in one direction or the other according as a rise or fall may be required in the advancing of the scale-bar any desired distance.

l/Vhere the diameter of the center opening in the cam-blank is larger than that of the boss c of the dial, I t the boss With a ring or rings Z, as clearly shown in Fig. 5, the Y number being governed by the size of the center opening in the cam-blank.

ln Fig. 6 l have shown a modification in which the adjusting device hereinbefore described is dispensed with and the scale-bar 10 is divided into inches with each inch divided into ten parts and each tenth into tour parts, making forty divisions to the inch. 0n the plug 20 is a. line of divisions of twenty-tive parts, numbered, 0, 5, l0, 15, Q0, 25. The twenty-ve parts or divisions correspond in extreme length to twenty-four divisions, or 24/11-0 of an inch on the scale 10. Each division on the plug, or Vernier as the line of divisions may be called, is therefore 1/25 of l/dO or one one-thousandth ci an inch shorter than the corresponding division on the scale-bar l0. By means of this arrangement the scale-bar can be moved one one-thousandth of an inch and the same results obtained as n the construction shown in Figs. 1 to 5. rihis modiiication, however, requires more care and is somewhat slower in operation than the preferred construction herein shown.

It is apparent from the foregoing description that changes in form and arrangement can be made without departing from the spirit of my invention and that such changes can be made without sacriiicing any of the advantages sought to be obtained by this invention; also that parts may be omitted without detracting from the eiiiciency or changing the operation of the remaining parts.

Having thus described my invention, what I claim is,-

1. A tool for laying out cams, comprising a graduated dial having a hollow central boss adapted to fit into a center opening of a cam-blank, a plug rotatable in said hollow boss, and a bar held to said plug and movable lengthwise thereon.

2. A tool for laying out cams, comprising a graduated dial, a pin adjustable radially on said dial and adapted to enter a pin hole in a cam-blank, and a bar adapted tor movement lengthwise and rotatable with the axis ot the dial as its center.

3. A tool for laying out cams, comprising a graduated diaha bar extending diametrially with respect to said dial and rotatably mounted thereon, a marking device at one end of said bar, and adjusting means at the other end of said bar to move the latter lengthwise any desired distance.

e. A tool for laying out cams, comprising a graduated dial, a plug rotatable on said dial, a bar slidable with reference to said plug and arranged diametrically to extend beyond the circumferential edge of said dial at diametrically opposite points, a screwrod secured to and rising from said dial and having a threaded portion parallel with said bar, a yoke secured to said bar, an internally-threaded sleeve engaging the threads of said screw-rod and having a reduced portion extending through said yoke, the projecting portion of said reduced portion being cxternally-threaded, and a nut threaded onto said projecting portion and bearing against the opposite side of said yok rr tool for laying out cams, comprising a graduated dial having a hollow boss extending trem its underside, a plug set into said hollow boss and rotatable therein, said plug having a groove formed on its upper tace with one side wall of said groove intersecting the axes of said plug and dial, a bar slidable in said groove, a screw-rod extending upwardly from said plug and having a threaded portion parallel with said bar, and an adjusting device threadingly engaging the threaded portion of said screw-rod and having connection with said bar to cause the latter to move lengthwise when actuating said adjusting device.

G. A tool for laying out cams, comprising a graduated dial, a part rotatable with respect to said dial and carried thereby, a bar supported by said rotatable part and movable lengthwise, means for adjusting said bar having connection therewith at one end, and a marking device at the other end of said bar.

7. A tool for laying out cams, comprising a Graduated dial, a plug rotatable centrally in said dial, a bar lengthwise movable on said plug and extending beyond the circumferential edge of said dial at diametrically opposite points, a screw-rol arranged parallel with said bar and carried by said plug, a sleeve threaded onto said screw-rod and having a reduced portion to form a shoulder, a yoke through which the reduced portion of said sleeve is passed and against one side of which the shoulder oi' said sleeve bears, said yoke having a notch at its lower end to receive said bar, a clamping screw passing through said yoke and provided with an L-shaped head adapted to engage said bar and clamp the same to said yoke, and a nut threaded onto the reduced portion of said sleeve and bearing against the opposite side of said yoke.

8. A tool for laying out cams comprising a graduated dial, a scale-bar lengthwise movable over said dial and mounted for .rotation, said scale-bar extending beyond the circumferential edge of said dial at diametr'cally opposite points, and a marking device secured to one end of said scale-bar comprising a supported sleeve, a punch pin extending trom the inner end of said sleeve, and a spring within said sleeve adapted to hold said punch pin in its outermost position.

9. A tool for laying out cams, comprising a graduated dial, a plug rotatable with respect to said dial and centrally supported thereon, said plug having a groove in its upper tace with one side wall ofsaid groove intersecting the axis of saidplug, a scalebarslidabie in said groove, and a marking device at one end of said scale-bar comprising a head secured to said scaiebar, a sleeve having a reduced portion secured in the said head, a punch pin arranged centrally in said sleeve and having a collar, a spring surrounding said punch pin and bearing with one end against the inner Wall of said sleeve and with its other end against said collar, and a `bushing fitting into the outer end of said sieeve against" which: saidcoilar is' caused t'o hear by 4the' action` of said spring. Y

In testimony whereof, I have aiiixediny signature-in thepresence oftwo subscribing Witnesses.

ALBERT HL.' SIMON S.

Y Witnesses: Y i

H. A. BEES, EMIL NEUHART.

opies of this patent may be obtained'for,l five cents each, byeddressing-thef Commissioner of Patentsi Washington, D; C. o 

